Secondary water heater



Dec. 30, 1930. OLSON ET AL fifi fi g SECONDARY WATER HEATER Filed Sept. 8, 1928 2 sheetwmet l Dec. 30, 1930. cs. OLSON ET AL SECONDARY WATER HEATER Filed Sept. 8, 1928 Z'ShBGtS-Shwt 2 Patented Dec. 30, 1 930 PATENT OFFICE GUNNEB OLSON AND EUGENE H. KEHL, OF CHICAGO, ILLINOIS SECONDARY WATER HEATER Application filed September 8, 1928. Serial No. 304,798.

Our invention relates to water heating and 1s specifically directed to a type of water heater intended for installation as an auxiliary water heating system in connection with a hot water boiler, steam heating plant or other steam generating system. 1n general, this device is adapted to be readily attached in an opening of a boiler, preferably below the .water line, so that the water passing through our device will become heated by contact of said device with the water in the boiler proper, thus maintaining a higher temperature in the water passing through our deviceas long as there is a temperature in the boiler water greater than in the water in the device. A major object of our device is to provide for the expansion and contraction of the material in our device occasioned by the varying temperatures incident to the passing of water through our device. In furtherance of the advantages to be so conserved our ob ject is to maintain a definite adjustment of our water channels under the changing conditions of temperature in the relation of the tubes of our system to each other, as well as their relation to the tubes in the boiler.

In the accompanying drawings, Fig. 1 is an elevation of our device, the tubes in broken sections. Fig. 2 is a longitudinal cross section of our device. Fig. 3 is a front view of one form of our device as shown from the face of the boiler. Fig. 4 is an elevation of our device taken along line 4-4 of Fig. 1. Fig. 5 is a frontal view of a tour tube form of our device. Fig. 6 is a cross section of .a multiple tube form showing an adjustable method of support for the tubes. Fig. 7 is a side view of the adjusting support for the tubes. Fig. 8 is an end support for the tubes, in their. relation to the tubes of the boiler. Fig. 9 is a side View of the end support shown in Fig. 8. As illustrated 10 is a broken section of a boiler wall to which our device may be attached. Our specific device consists of parallel tubes 11 and 11a, one above the other. One end of eachof these tubes isset in a member 12 having a channel 12a adapted to connect the said tubes. The opposite ends of said tubes 11 and 11a areset in a head member 13, said head member 13 being adapted to be positioned against the outer surface of the boiler wall 10 and adapted tobe attached to said wall by locking members 15. The member 13 has a dividing wall 18a which separates a water channel 18 from a water channel 19 so that the water passing into the device at 18 takes its course through the lower tube around the member 12 through the channel 12a, and through the upper tube llaand through the channel 19. The length of the tubes 11 and 11a vary with the boiler requirements. \Ve provide that the lower tube 11 shall be shorter than the upper tube 110, and that the, member 12 shall have one of its channels longer to match with the length of the lower tube and one of its channels shorter to match with the length of the upper tube. In the process of heating water by such a device the water entering the lower tube at 18 is cold in comparison with the water passing out of the upper channel at 19; as the water travels through the lower tube coming into contact with the heated water in the boiler its temperature is raised so that by the time it reaches the channel turn in the member 12 the absorbed heat tends to expand the material through which the water is flowing in proportion to its temperature, and when it is traveling through the upper tube the expanded relation of the upper tube to the lower tube is such as to tend to change the relation of the members and aifect their action.

In the device as shown and described there is attached to the member 12 a spider device somewhat of a character as shown in Fig. 8, which said spider rests upon the water tubes of the boiler, whereby the elongation and contraction of the tubes 11 and 11a may be properly supported and also act as a fulcrum for the activity of the tubes to be described. WVhereas it has been found that where the tubes are of equal length and are either joined by a bended tube or by a channelled end piece connecting the two tubes a breakage occurs by reason of the contraction and expansion of the tubes. In the device of the applicant the tubes are inserted in the member .12 enough distance to have a positive hearing. The metal in the number 12 being ofa different character from the metal in the structure of the tubes it is constructed primarily of such metal and such shape that there is no breaking point between the metal inthe tubes and the metal in the elbow member 12. The lower part of the member 12 which is joined to the tube 11 is of a different length from the part joining with the tube 11a. As the tube 11a expands its inclination is to force the member 11 lonitudinally; that bein the action the memer 12 would be norma ly driven in the same direction of the elongation of 11a; the member 12 having a bearing on the tubes of the boiler this bearing member 12 at the oint of the s ider 25 becomes a fulcrum an the greaterlio yeof metal in member 12 gri ping them 11 curves the tube 11 in t e direction of the tube 11a. The curvature of these tubes in concentric relation compensates for the ex ansion, the smaller are described by the ower tube 11 being alwag: sufficient to meet the elongation of the tu 11a. And what difference may occur is completed by the difference in the amount of metal contained in the upper and lower portions of member 12. i

In the device as shown we provide two structures of metal which are differently affected by the temperatures within the mecha nism and the temperature in the boiler; we provide a longer portion of tube in the upper conduit so that the expansion therein is more nearly balancing to the lower tube than is the result when the two tubes are of the same length, it being readily recognizable that the upper tube is constantly more exposed to hi h temperatures.

In attaching the device to the wall of the boiler a flange 13b upon the head 13 is made to enter an aperture in the boiler wall and a radial flange 130 is adapted to rest against the outer ortion of the boiler wall 10. In this radia flange 130 we rovide holes through which an attaching bo t 17 is passed, by means of a wire threaded into the bolt and removed after the nut is ut on and drawn up; the said bolt is threaded into a locking device 15 which is a nut having a flan e extending substantially half way aroun said nut 15 and having on the opposite side of said nut a leg 16 with an extension below the face of the nut; the flange being adapted to rest against an inner wall of the boiler as a bearmgsurface and the leg 16 to rest upon an inner surface of the head 13 so that as the bolt 17 is drawn up the device is securely locked to the boiler wall; the leg 16 seated between the two tubes prevents turn- Ive show in Figures 1 to 4 a head with two tubes enterin one above the other. In Figures 5, 6 an 8 we show a head with four tubes entering but in each case the openings for the entry of cold water and the exit of hot water are similar, being adapted to pipe attachment extending in either direction, from the head. In each case a partition 13a in the head divides the upper tubular openings from the lower, irrespective of the number in each series.

For the uniform mountings of the tubes and the permanent sustaining of the same in exact relation we provide an adjustable mountin composed of two members and a screw. ne of said members 20 has a pair of arms at the top and a similar pair at the bottom adapted to rest on corresponding surfaces of the upper and the lower tubes. On this member 20 is a lug 22 extending outwardl therefrom and having a perforation theret rough for the passage of a bolt 24; the other member 23 has at the top thereof and at the bottom thereof a pair of arms whose tube encircling portions are oppositely curved from the arm portion of the member 20. A neck portion of the member 21 has a threaded hole 23 therein adapted to register with the hole 22 in the member 20. It will be readily seen that when the tubes are assembled and these supporting members are placed in relation between said tubes, the movement of the screw 24 will perfectly adjust the tubes in relation to each other and sustain them in that relation inside the boiler and assist in protecting the said tubes against any distortion or change of relation to each other.

We also rovide bosses 14 on the outer end of the castlng 12 and these bosses are tapped longitudinally. We provide a support 25 consisting of a webbed member having holes transverse thereof adapted to re ister with threaded holes 14in the casting. his member 25 has semi-circular flanges 26 on the bottom thereof adapted to rest upon and between the spaced tubes 27 of a boiler-providing fixed support inside the boiler for the ends of our device, and also providing means to sustain the internal end of our device in positive relation to the boiler tubes under any claimof expansion or contraction.

We do not limit ourselves to the specific device shown except insofar as we are limited by the scope of our claims.

We claim:

'1. In combination with a boiler an auxiliary water heater comprisin a head external of the boiler having a ange entering through an aperture of the boiler, and adjacent thereto a radial flange for external contact with the boiler; vertical openings in the face of the head; and vertical openings in the rear of the head-'in the portion extending through the aperture into the boiler; a

artition wall between the up er and the ower holes; tubular members xedly positioned in the holes in the rear of the head; the lower of the tubes being shorter than the up er of the tubes, the said lower tube being evised to receive colder water as-it' enters the device, the upper of said tubes adapted .to transport the said water out of the device after it has been raised in temperature by contact with the contents of the boiler; a member bent upon itself forming the connection between the two tubes at their outer end, the lower portion of said connecting member being a longer channel than the upper portion accommodating the dif ference in length between the lower tube and the upper tube;

2. In a device for the purposes described a head member for external contact with the boiler, tubular portions extending therefrom adapted to extend into the area of a boiler, the lower said tubes adapted to receive water of a low temperature and the upper" of said tubes adapted to be a channel for the said water at a higher degree of temperature, the said tubes for the conduct of water being of different lengths whereby to compensate for difierence in temperature; a connecting means for the ends of the tubes apart from the head constructed of a different type of material from the material constituting the tubes; a division in the head providing for a separation of the inflowing from the outflowing fluid.

3. In a water heater for the purposes described a head having vertically disposed chambers, an inlet and an outlet on the front thereof; an inlet and an outlet on the rear thereof; a partition wall dividing the inlet from the outlet in each case; tubular members fixedly inserted in the inlet and outlet on the rear of the head and adapted to extend into the water area of a boiler, the upper of said tubes being measurably longer than the lower of said tubes; a connecting outer end to said tubes having channels of varying length adapted to compensate the difference in length of the upper and lower tubes; the upper and lower channels of said outer end attachment respectively connecting providing an uninterrupted flow from a lower aperture in the head to an upper aperture.

4. A water heater comprising, in combination, a head for external attachment to a water boiler, separated channels through said head, separated tubes communicating with said channels in said head, each channel reversed upon itself forming a connection between the ends of the tubes distant from the head, the tubular portions of said channels being of different lengths, the outer joining member having channels of difiering lengths and adapted to compensate the differing lengths of the tubes; means for attaching the device to a wall of a boiler.

5. A water heater comprising, in combination, a head for external attachment to a water boiler, separated channels through said head, separated tubes communicating with said channels in said head, each channel reversed upon itself forming a connection between the ends of the tubes distant from the head, the tubular portions of said channels bein of difierent lengths, the outer joining mem er having channels of differing lengths and adapted to compensate the different head comprising upper and lower chambers,

a plurality of tubular members attached thereto, the lower of said tubular members communicating with the lower chamber and the upper of said tubular members commu nicating with the upper chamber, the said tubular members having their axes vertically related and horizontally disposed; means to join the said tubes in upper and lower pairs at their rear ends forming continuous channels between the lower and the upper of said tubular channels; means consisting of two skeletonseach having extending arms adapted to rest upon the circular outer surface of the tubes, each of said skeletons having its arms shaped to adjust to opposite sides of the tubes, one of the said skeletons having means thereon for receiving an adjusting member and the other of said skeletons having means for a complementary adjusting device whereby when an adjusting member is functioned the said tubular members are brought into parallel and fixed uniform relation.

7 In a device for the purposes described, an auxiliary water heater having a multiplicity of tubes extending into the water area of a boiler, means for attaching it to the wall of the boiler; means for balancing and permanently adjusting the relation of the tubes to each other; and means attached to the internal structure of a device by which to preserve a fixed relation longitudinally of the tubular members to the tubular portions of the primary boiler.

Signed at Chicago, Illinois, 17th Aug,

EUGENE H. KEHL. GUNNER OLSON. 

